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The aim of my investigation was to explore the viscosity of golden syrup using stokes law to calculate the viscosity of the liquid.

Extracts from this document...

Introduction

Stokes's law is the basis of the falling-sphere viscometer, in which the fluid is stationary in a vertical glass tube. A sphere of known size and density is allowed to descend through the liquid. If correctly selected, it reaches terminal velocity, which can be measured by the time it takes to pass two marks on the tube.

The aim of my investigation was to explore the viscosity of golden syrup using stokes law to calculate the viscosity of the liquid.

Apart from superfluids, liquids and gasses have the property of viscosity. Viscosity is measured in Pascal-seconds; this describes its resistance to deformation and the ease that which it flows. Viscosity is internal friction this is due

...read more.

Middle

These are the results I gathered from my dropping.

Ball Radius

1

2

3

4

5

6

7

8

9

10

‘Medium’5.955mm

23.28s

22.18s

22.41s

22.28s

21.53s

21.66s

21.84s

20.31s

20.40s

20.97s

‘small’ 4.69mm

30.00s

31.05s

27.90s

28.28s

28.50s

30.50s

30.19s

30.19s

29.19s

30.96s

Averages:

‘Medium’ – 21.686s

‘Small’ – 29.673s

There is an increase in speed

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Conclusion

image07.png

The graphs show the ball bearing size the drop attempt and the time taken. The black line shows the average of the drops.

The medium sized ball has a small gradient on the graph, this could be because of air bubbles in the golden syrup during the test, this would create a small amount of extra time to get to the bottom as the air bubbles will create resistance.

The ball bearing weight can be determined with image08.png=mg

g=9.81

m=

p=Density in kg/m

The density of chrome steel is 0.283 lbs/cubic inch

(http://www.precisionballs.com/TDS/Ball_Bearing_Steel.htm)

This is in cubic inches but I need it in kg/mimage09.png

The density in kg/mimage09.png is 7833.4.13kg/mimage09.png

V= Volume of sphere image02.png

R= Radius of sphere (0.00596m)

V = 0.0008868

M = 0.006947kg

Fg= 0.0682 – ‘Medium’ Ball

image03.jpg

...read more.

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